A quarterback back pedals 2.2 meters southward and then runs 6.8 meters northward, what is the distance, the magnitude, and direction?

Answer:10.3

Explanation:

Answer:

The gravitational potential energy of the can dropped from a shelf that is 1.5 m high, is 10.29 J. Rounding the answer to the nearest tenth of a joule, we have that the potential energy is 10.3 J.

Explanation:

The potential gravitational energy can be written as

[tex]V=mgh[/tex]

where m is the mass of the object, g is the gravitational acceleration, and h is the altitude of the object.

One thing we must understand is that V is a relative quantity, so we need to establish an altitude where V=0, in this case, the zero potential could be at the floor, so the altitude where the can is beeing dropped is h=1.5m.

Doing this, we have that

[tex]V=(0.7kg)*(9.8\frac{m}{s^2})*(1.5m)=10.29J[/tex]

and when rounded, we have the final answer:

[tex]V=10.3J[/tex]

Answer:

London dispersion forces.

Explanation:

London dispersion forces, are the weakest type of intermolecular interactions. Its name is due to the contributions of the physicist Fritz London.

London forces explain how molecules whose structures and atoms prevent the formation of a permanent dipole. It basically applies to apolar molecules or to atoms isolated from noble gases.

Fluorine is a gas at room temperature, pale yellow in color, made up of F2 diatomic molecules. London forces are present in this gas since it has a homogeneous electrostatic distribution, which can suffer instantaneous dipoles and lead to polarizations.

Answer:

they are more spread out and moving faster than those at the surface

Explanation:

fast easy and you don't have to read a whole book for the answer

Final answer:

Water molecules closest to the burner are more spread out and moving faster due to increased kinetic energy that leads water to transition from liquid to gas at the boiling point. This contrasts with the surface molecules that move less rapidly.

Explanation:

When boiling occurs in water, as the water molecules closest to the burner receive heat, they gain energy and move faster than the molecules at the surface. In this energized state, the molecules start moving more rapidly and become more spread out because the heat imparts kinetic energy to them, which is necessary to overcome the attractive forces between the water molecules. This increase in kinetic energy is what leads water to transition from the liquid phase to the gas phase at the boiling point.

Therefore, the water molecules closest to the burner are more spread out and moving faster than those at the surface of the liquid. Since the water at the boiling point has the water molecules throughout it gaining sufficient kinetic energy to vaporize, this agitation results in the formation of bubbles, which is a hallmark of the boiling process. At the surface, however, the evaporation is occurring at a lower rate than the boiling within the bulk of the liquid. Consequently, the surface molecules are not moving as rapidly as those at the bottom near the burner.

The final displacement of the delivery truck from the origin is calculated using vector components and the Pythagorean theorem. After traveling north, east, and south, the magnitude of the displacement is approximately 17.7 blocks.

The question is asking for the final displacement of a delivery truck after it travels a certain distance in a city grid, which involves vector addition to determine. To calculate the displacement, we consider the truck's movements along the north-south axis and the east-west axis separately. The truck travels 21 blocks north, then 26 blocks south which results in a net movement of 5 blocks south (since 26 - 21 = 5). Along the east-west axis, it travels 17 blocks east with no westward movement. Now, we can use the Pythagorean theorem to find the magnitude of the displacement since the movements along north-south and east-west are perpendicular to each other.

Displacement magnitude = √(southward movement2 + eastward movement2) = √(52 + 172) = √(25 + 289) = √(314) ≈ 17.7 blocks

Therefore, the magnitude of the displacement of the truck from the origin is approximately 17.7 blocks.

As per the question the diagram given is a vertical line.

We are asked to calculate the position of X.

Here the vertical line is divided into many segments.

As per the diagram, it is obvious that the points marked at different positions are separated by four units from each other i.e the distance between two successive marks is 4 units.

The point X is situated at four marks away from 0.

Hence the position of X will be= 4×4 units

                                                    = 16 units

Hence the correct answer of this question is D.

The correct answer is option 4, 16.

Explanation

Each division on the number line represents 4 units. The point X is located 4 divisions above 0, the origin. On this particular number line, 4 divisions represents [tex]4\times 4=16[/tex] units. This means that the point X is located at [tex]y=16[/tex] on the number line.

The correct answer is the 4th option, whose value is 16.

Final answer:

Mechanics extend the handle of a wrench with a pipe to increase leverage and torque, making it easier to remove very tight bolts, based on the physics principle of the lever arm. While effective, this increases the risk of over-torquing and potentially damaging equipment or injuring oneself.

Explanation:

When mechanics need to remove a very tight bolt, they may use a tactic that involves sliding a length of pipe over the handle of a wrench. This technique provides additional leverage which increases the torque applied to the bolt, making it easier to loosen. The physics principle at play here is that of the lever arm, where a longer handle effectively increases the distance from the pivot point (the bolt in this case), requiring less force to achieve the same amount of turning force or torque.

However, this increased torque also brings with it risks; applying too much force can shear or snap a bolt, potentially leading to equipment damage or personal injury. Therefore, while extending the handle of a wrench can be helpful, it is important to use this method with caution to avoid over-torquing.

Why Pipes over Wrench Handles Work

The principle behind using a pipe over a wrench handle is simple: a longer handle means you have a larger radius to apply your force, which translates to more torque on the bolt or nut.

Using Newton's second law of motion, we find that the dummy's deceleration, given a net force of 825N and a mass of 75kg, is -11 m/s².

To calculate the dummy's deceleration, we would make use of Newton's second law of motion, which states that the acceleration of an object as produced by a net force is directly proportional to the net force and inversely proportional to the mass of the object (F = ma).

In this scenario, the net force (F) is 825N (towards the rear of the car it would be considered negative), and the mass (m) of the dummy is 75kg. We can rearrange the equation to solve for acceleration (a), by dividing both sides by mass (m), giving us: a = F/m.

So, the dummy's deceleration (which is negative acceleration) would be -825N/75kg = -11 m/s². Therefore, the dummy's deceleration is -11 m/s².

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The maximum height reached by the arrow launched straight upward with an initial speed of 35 m/s is 62.5 meters.

To calculate the maximum height reached by an arrow launched straight upward, we can use the equations of motion. Neglecting air resistance, the arrow will reach its maximum height when its vertical velocity becomes zero. The equation to calculate the maximum height, h, is given by:

h = (v2) / (2g)

where v is the initial speed of the arrow and g is the acceleration due to gravity.

Plugging in the values, we get:

h = (352) / (2 * 9.8) = 62.5 meters

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Answer:

A bimetallic strip bends so that the steel is on the outside curve.

Explanation:

A bimetallic strip is a combination of two different metals. The linear  coefficient of expansion of various metals are different, depending on their characteristics. For example, when a bimetallic strip of brass and steel are taken, thermal expansion coefficient of brass is more than that of steel.

That implies brass expands more than steel, for a given amount of heat supplied. So brass will curve outward since it becomes longer compared to steel. Steel will curve inwards.

Similarly, for cooling process where a drop in the temperature occurs, brass contracts more compared to steel and so Steel will be on outside curve.

Light is a form of electromagnetic radiation that is visible to the human eye. The Earth is approximately 1.98 × 10¹¹ meters (198 million kilometers) away from the Sun.

Light is a type of energy that travels in the form of waves or particles called photons. Light is a fundamental component of our everyday lives and plays a crucial role in how we perceive and interact with the world around us.

Light is composed of different wavelengths, which determine its color. The visible spectrum of light ranges from shorter wavelengths, such as violet and blue, to longer wavelengths, such as green, yellow, orange, and red. When all these colors are combined, they form white light.

To determine the distance between the Earth and the Sun, we can use the formula:

Distance = Velocity × Time

Given that the velocity of light is 3 × 10⁸ m/s and the time taken for light to reach Earth is 8.3 minutes (or 8.3 × 60 seconds), we can substitute these values into the formula:

[tex]Distance = (3 * 10^8 m/s) * (8.3 * 60 s)[/tex]

Calculating the equation:

Distance = 1.98 × 10¹¹ meters

Therefore, the Earth is approximately 1.98 × 10¹¹ meters (198 million kilometers) away from the Sun.

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Answer:

It gets released

Explanation:

a neutron. When electrons in an atom in an excited state fall to lower energy levels, energy is. released, only. (The ground state is the lowest energy state. To raise the atom to an excited state, energy must be added. To fall back to the ground state (lowest energy), the energy it had absorbed must be released.)

The net force on a car being pushed up a hill at constant velocity is zero because the forces pushing the car uphill exactly balance the forces pulling it downhill, as per Newton's first law.

When a stalled car is pushed up a hill at constant velocity by three people, according to Newton's first law, the net force acting on the car must be zero. This is because if an object is moving at a constant velocity, there is no acceleration, which implies that the sum of all forces acting on the object is zero. In this case, the forces involved include the force of gravity acting downward on the car (its weight), the normal force acting perpendicular to the surface of the hill, the force of friction opposing the motion, and the pushing force by the people. Each of these forces has a vertical and horizontal component that must be considered.

For the car to have a net force of zero, the forces pushing the car up the hill must exactly balance out the forces such as gravity and friction that oppose this motion. Specifically, the uphill pushing force (from the people) plus any component of the normal force, must balance out the downhill force of gravity and any frictional force. Since the question states the car is moving at constant velocity, we can conclude that the forces are balanced, and therefore, the net force on the car is zero.

The awser is c)Pressure will compress a gas, reducing its volume and giving it a greater density and concentration of particles.

Final answer:

To find the distance of the lightning bolt, multiply the speed of sound (340 m/s) by the time delay between seeing the flash and hearing the thunder (3.5 seconds), resulting in a distance of 1190 meters.

Explanation:

To calculate the distance of the lightning bolt, we will use the information that the speed of sound in air is about 340 meters per second (m/s). When you count the time from seeing the lightning to hearing the thunder, this time difference is due to the fact that light travels much faster than sound and reaches us almost instantaneously. Here are the steps for the calculation:

The law of conservation of electric charge asserts that in an isolated system, the total electric charge remains constant. Electric charge cannot be created or destroyed; it can only be transferred between particles, underpinning fundamental principles in electromagnetism and physics.

The conservation of electric charge is a fundamental principle in physics known as the law of conservation of charge. This principle states that the total electric charge in an isolated system remains constant over time. In other words, electric charge cannot be created or destroyed; it can only be transferred or redistributed within the system.

This law is rooted in the fundamental properties of matter and the nature of electric interactions. At the atomic and subatomic level, matter is composed of positively charged protons, negatively charged electrons, and neutrally charged neutrons. Any change in the distribution of electric charge within a system must involve a transfer of electrons between atoms or particles. When electrons are transferred from one object to another, one becomes more negatively charged, and the other becomes more positively charged, ensuring that the total charge remains conserved.

The conservation of electric charge is essential for understanding various electrical phenomena and is a foundational principle in electromagnetism. It plays a crucial role in circuit theory, electrostatics, and electromagnetic interactions, providing a framework for understanding and predicting the behavior of electric charges in a wide range of physical processes and systems.

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The probable question may be:

During any process, the net electric charge of an isolated system does not change. Explain.

The electromagnetic spectrum contains both visible and invisible part of the spectrum like UV, X, Gamma, IR and so on.

Electromagnetic spectrum, the complete dispersion of electromagnetic radiation by frequency or wavelength Even though all magnetic waves move at the speed as in a vacuum, do so at a variety of frequencies, durations, and particle energies.

The range of all electromagnetic waves is represented by the electromagnetic spectrum, which also includes numerous subranges, or sections, such as visible light, and ultraviolet radiation.

Light will come in a variety of "colors" that really are invisible to the human sight, including radio, infra, ultraviolet, X-ray, & gamma rays. The visual system can only detect visible light. Infrared light, which is on the side of the spectrum but is too red for people to see, is all over us and is even released by our bodies.

The region of electromagnetic radiation that the human eye can see is known as the visible light spectrum. This group of wavelengths is more commonly referred to as visible light. The range of wavelengths that the visual system can typically see is from 380 to 720 nm.

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Final answer:

The electromagnetic spectrum includes all types of electromagnetic radiation, from gamma rays to radio waves. Visible light, which humans can see, is a narrow portion ranging from 380 to 740 nm. Different species perceive different parts of the spectrum.

Explanation:

Electromagnetic Spectrum Overview

The electromagnetic spectrum consists of all types of electromagnetic radiation, which vary in their frequencies and wavelengths. The spectrum includes both visible and invisible light, with visible light being the small portion that can be perceived by the human eye. Electromagnetic radiation encompasses a wide range of types, including gamma rays, X-rays, ultraviolet (UV) light, visible light, infrared (IR) radiation, microwaves, and radio waves. The visible spectrum specifically is comprised of light in the wavelengths from approximately 380 to 740 nanometers (nm), displaying a rainbow of colors where violet and blue are at the shorter wavelength (higher energy) end, and red is at the longer wavelength (lower energy) end.

Other species can detect different parts of the spectrum; for example, honeybees can see UV light, and some snakes sense infrared radiation. Moreover, the spectrum is detailed by its frequency and wavelength, with visible light occupying a very narrow band, predominated by colors when separated by a prism.

Each part of the electromagnetic spectrum has unique properties and uses in various applications, such as medical imaging (X-rays), telecommunications (microwaves and radio waves), and in studying celestial bodies and phenomena (gamma rays).

Newton's Third Law of Motion and his Law of Universal Gravitation are connected through the action-reaction pair concept, where the gravitational force between two objects satisfies both laws, allowing the explanation of planetary motion.

Newton's Third Law of Motion states that for every action, there is an equal and opposite reaction. This principle can be seen in the way forces operate between two bodies due to gravity. Newton's Universal Law of Gravitation provides the mathematical expression for gravitational attraction stating that every particle in the universe attracts every other particle along a line between their centers of mass. The force of attraction is directly proportional to the product of their masses and inversely proportional to the square of the distance between them.

When you apply Newton's Second Law of Motion, which relates force to mass and acceleration (F=ma), to the force defined by the Law of Universal Gravitation, you get a clear description of how bodies move under the influence of gravity. This also helps to understand Kepler's laws of planetary motion in a more profound way. The connection is evident when considering the gravitational force between two objects, such as the Earth and the Moon, which acts as an action-reaction pair. This action-reaction pair satisfies both the Universal Law of Gravitation and Newton's Third Law, allowing Newton to elucidate the motion of the planets, which was one of the most important physics problems of his time.

The answer is virtual.

Explanation:

The image formed by convex mirror is virtual and erect always.

Let's consider two cases :

(1) When the object is placed at infinity, the image will be formed at the focus and behind the mirror. A point sized image will form and its nature is virtual and erect.

(2) When the object is placed anywhere from infinity to pole of the mirror, then the image will form between pole and focus. Its size is diminished and nature is virtual and erect again.